/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeSourceNode.h
If the unique instance doesn't exist it will return nullptr. This function should be use by the pipelines, to avoid creating a node.
static const [UInterchangeSourceNode](API\Runtime\InterchangeCore\Nodes\UInterchangeSourceNode) * GetUniqueInstance ( const [UInterchangeBaseNodeContainer](API\Runtime\InterchangeCore\Nodes\UInterchangeBaseNodeContainer) * NodeContainer )